Gudgeon-pin-locking device.



I F. H. ROYCE. GUDGEON PIN LOCKING DEVICE.

APPLICATION FILED SEPT-19.19%.

flu/enter,-

Patented Apr. 17, 1917.

= D STATES PATENT "o FroE.

FREDERICK HENRY ROYCE, F DERBY, ENGLAND, ASSIGNOB, T0 ROLLS ROYCE LIMITED,

. OF DERBY, ENGLAND.

tapped to GUIDGEON-PIN-LOCKING DEVICE.

Patented Apr. 17; 191W.

Application as September 19, 1916. Serial No. 121,0119.

a To all whom it may concern.-

Be it known that I, Fnnnnmon HENRY Boron, a subject of the Kin of England, residing at Derby, in Englan have invented certain new and useful Improvements in Gudgeon-Pi11-Locking Devices, of which the following is a specification.

This invention relates to improvements in meansfor securing gudgeon-pins for instance for those pistons of internal combustion'engines, and moreparticularly engines for motor vehicles, aeroplanes and the like which are usually fitted with pistons of light construction having thin walls.

The primary object of the invention is to prevent the body or walls of the piston being distorted by the fixing device of the gudgeon pin; and a further object is to provide a locking mechanism which is capable of be ing made of extremely light weight.

n the accompanying drawings, which illustrate by way ofexample the manner in which this invention is applied to a motor vehicle engine piston Figure 1 is, a sectional elevation of the piston,

' Fig. 2 is a broken View in end elevation of the piston showing. the locking device for the dgeozn pin, and

Flg. 3 is a sectional plan gudgeon pin.

In all the views similar parts are marked I through the with like letters of reference."

The hollow gudgeo'n-pin a is shown fitted into the usual type of bosses b formed'im te al with the piston c, the gudgeon pin of fixing the lock ng'device, while at the opposite end a suitable shoulder a is formed for positioning the gudgeon-pin endwise, said shoulder engaginga recess a in the piston. f v

The locking device consists of a member or plate at having lateral tongues d fitted across one-end of the gudgeon-pin and accommodate a screw or set pin a.

The ton ed" member (5 is fixed into slots 0 formed in the pistons and also slots or the equivalent 0 formed in the end of the gudgoon-pin. When the'screw or set pin 6 and tongued memben d are in position, the

dgeon pin is prevented is only allowed a small predetermined amount of endwise movement.

from rotating, and

Any suitable device may be used to lock.

the screw onset pin e but I prefer the one shown in the accompanying drawings wherein a flange e is formed integral with the set pine this flange being slottedaround its periphery as at e to accommodate 'the rivet f. The spring finger f is arranged to press against and, dropinto one of the" slots e formed in the flange e thusmaln-ng it impossible for the screw or set pin e'to turn until the end of the spriii finger f ,which projects through the go geon in'a, is brought out of engagement with t e slotted flange e. turned by means of a box or tube spanner inserted from the open end of'the gudgeonpin. v v It should be observed that a clearance a; is left between the inside of the shoulder a of the gudgeon-pin and the piston 0, the

object of this being to allow the: dgeon' pin to float between certain smal; predetermined limits, and in this mannerito pro-- vent the gudgeon pin securing device from distorting the piston.

What I claim as m to secure by Letters States is I H 1. The" combination with a piston having exterior recesses, of a hollow gudgeon-pin extending through said .piston and having recesses at one end, and a shoulder at the ogp'osite end thereof, and a locking plate a atent of the United apted to engage the recesses in the gudgeonin and the recesses in the piston. 2. n a'piston, the combination of ahollow gudgeompin having recesses at one end,

.there bem a recess in the piston cooperating therewith, of a locking member, tongues on the locking member adapted to engage The screw or set pin may be if ii invention and desire said recesses, a screw adapted to secure the locking member to the ad on pin, and means within the pin for" ockmg said screw against rotation.

'3. In a piston,

the combination o'fla hollow gudgeon-p having recesses at one end, there being a recess in the piston eoiiperating therewith, of a locking member, tongues on the locking memberadapted to'. engage said recesses, a screw adapted to secure t e locking member to the gudgeon pin, said screw having a slotted portion and a re-' v recessespineans siiient deviceseoured 'within'the udgeonpin adapted to engage said slotte portion for locking said screw against rotation. v

4. The ooinbination with a piston having exterior recesses in its Wall, of a hollow gudgeon-pin, extending transversely through said piston,ha ving a shoulder at one end engaging certain, of 'saidpiston recesses, a locking plate atthe opposite end of said gudgeoh'pm engaging others of said piston V for attaching the locking plate to the, gudgeon-pin and devices within the gndgson-pin for locking said securing means 5. Thecornibination with a piston havin exterior roeerses in its wall, of'a hollow gu geon-pin a extending transversely through said piston, "having a shouider at one end 'ascrew within the pinfor attachinga the engaging certain of said piston recesses, a locking plate at the opposite end of said g'udgeon pin engaging others of said piston recesses, means for rotation between'said loc g plate and pin,

locking plate to the pin,.a. slotted nge on the screw and a spring finger secured within the pin adaptedto en said slotted .flan'ge to secure the screw against rotation.

In witness whereof I have signed this specification in the presence of two wit- 1 FREDERICK HENRY ROYCE. Witn: I

ALBERT Gnonon ELLIorr, Lem MABEL WoLmsoN.

E'Jeventing relative 

